A simple decision for the 45/2.8

I've already decided to stick with the G1 as clearly more capable than the GF1.

20/1.7 Inferior to the kit zoom in image quality, IS and flexibility.
Superior to the kit zoom in size, weight and DOF.

45/2.8 Superior (I'm guessing) in IQ to the other 2, Equal to the kit in size and weight, and has 1/3 the DOF at 5' of the 20/1.7, and has IS. Should have a brighter viewfinder image than the kit. It doesn't extend when focusing. The macro ability is a minor plus, but should work great with the G1.
20/1.7 is superior to it only in size and weight.